Improved lathe for turning heads of nails



, l UNITED States PATENT OFFICE.N

WM. H. NICHOLS AND HORATIO H. ABBE, OF 4CHATHAM, CONNECTICUT.

IMPRovED LATHE FOR TURNING HEADS oF NAILS, TACKS, are.A

Specification forming part of Letters Patent No. 49,139, dated August l, 1865.

p following is a full, clear, and exact description thereof, which will enable others skilled in the art to Inake and use the same, reference being had to the accompanying drawings, making a part df this specification, in which- Figure l is a front View of our invention; Fig. 2, a plan or top view of the same; Fig. 3, aview of a head turned and ornamented by our invention.

Similar letters of reference indicate like parts.

This invention relates to a new and improved means for chucking the heads to be turned and ornamented.

A represents the base of the machine, and B B two uprights thereon, in which a mandrel, C, is ittedJ On one end of this mandrel there is fitted loosely a thinible, D, which is allowed to slide freely, the mandrel being allowed to turn freely within the thimble. This thimble has a groove, a, made circumferentially in it to receive a fork at the upper end of a vertical plate, E, which is attached to a horizontal slide, F, having a spiral spring, G, upon it, which spring has a tendency to keep the thim-` ble H drawn back in contact with a shoulder, b, on the mandrel C.

I is alever, which is attached by a fulcrumpin, c, to the inner upright, B, and has a rod, d, at its front end which projects behind the plate E, as shown clearly in Fig. 2.

J represents a cap at the end of an arm, K, which is attached by a fulcrum-pin, e, to a framing, L, on the base A. This leverK works in a horizontal plane, and it is placed in such relation with the mandrel C that whenshoved toward the latter the cap J will be brought in line with the end of the mandrel. The back end ot the lever K has a spiral spring, M, attached to it, which has a tendency to keep the cap J out from the mandrel.

N is a lever, of bent form, by which the arm K is operated.

O is a slide, which is fitted between guides ff on the base A, and has spiral springs g connected to it at its under side.l The slide O has an upright, P, attached to it, said upright having a collar, h, on its upper part, by which a cutter, Q, is secured to it. The cutter Q is made of such a form that it will turn the head in proper shape at one operation, the cutter being brought to the head by actuating a lever, It, which is attached to a shaft, S, be`` low the slide 0,- said shaft having apin, i, projecting radially from it, and which is fitted in the under surface ofthe slide O. The springs g have a tendency to keep the cutter Q back from the head on the end of the mandrel.

We give the mandrel of our lathe a back-` ward motion, applying the cutting-tool to the back side of the object to be cut or turned, so that said cutting-tool may be out of the way of the operator and aiiord the best possible arrangement ot' all the parts in combination, in order to avoid all interference between any of those parts, and to enable the operator to perform his work with great rapidity and ease, either in a sitting or standing posture.

T is a milling-tool, which is composed of a` wheel having a serrated periphery, and tted loosely on the end ot' an arm, U, which is at tached at right angles toa shaft, V, the bearing j of which is o'n the framing L. On the back or outer end of the shaft Vthere is tted an arm, W, one end of which is connected by a rod, 7c, with a treadle, and the opposite end having a spiral spring, l, attached to it, said spring having a tendency to keep the millingtool up free fromthe mandrel.

The heads X to be turned and ornamented are cast on the tacks or nails, and the latter are shovedinto a hole in the end of the mandrel C, the head Iitting over the end of the mandrel, as shown in red in Fig. l, and pressed thereon bylineans of the cap J, which is forced or pressed against the cap by actuating the lever N. When the head X is thus adjusted on the mandrel the slideO is actuated through the medium of the lever It, and thc cutter Q is brought in contact with the head, which ro tates with the mandrel and is turned in proper form by the cutter. The shaftVis then turned so as to bring the wheel or milling-tool in contact with the lower part or flange of the head, and said part or iiange is milled and the head iinished. The lever I is then actuated so as to throw'the thimble Houtward on the mandrel, p

and the finished head is discharged from the mandrel.

Having thus described our invention, we claim as new, and desire to secure by Letters Patentl. The employment or use of the cap J, attached to the arm K, arranged, substantially as shown, in suoli relation with the mandrel C to admit of the head being readily adjusted on the mandrel, as set forth.

2. The combination of the cap J, millingtool T, cutter Q, and thimble H, all arranged and combined with a mandrel, C, to form a new and improved lathe, for the purpose specified.

WM. H. NICHOLS. HORATIO H. ABBE.

Witnesses:

CLARK STRONG, ALEXANDER H. MARKHAM. 

